John j



(No Model.)

J. J. PETERSON.

LOOK.

Patented Sept. 21,1897.

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JOHN J. PETERSON, OF PORT LAVACA, TEXAS.-

LOCK.

SPECIFICATION forming part of Letters Patent N 0. 590,334, datedSeptember 21, 1897.

Application filed December 29, 1896. Serial No, 617,388- (No model.)

To all whom, it may concern.-

Be it known that 1, JOHN J. PETERSON, a citizen of the United States,residing at Port Lavaca, in the county of Calhoun and State of Texas,have invented certain new and useful Improvements in Locks; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

This invention relates to improvements in looks; and it consists ofcertain novel constructions, combinations, and arrangements of parts,all of which will be hereinafter more particularly set forth andclaimed.

In the accompanying drawings, forming part of this specification, Figure1 represents a rear elevation of the lock embodying my inventiondetached from the door, and Fig. 2 represents a central verticaltransverse section through said lock on the line of thevertically-movable tumblers.

A in the drawings represents the casing; B, the bolt; 0, the key, and Dthe verticallymovable tumblers. Said bolt 13 is provided in itsuppersurface with a plurality of notches Z) of similar depth and an endnotch b of less depth. This bolt is adapted to slide longitudinallywithin a suitable groove a, formed in the casing, so as to project fromone end of the casin g to enter the door-casin g and lock the door towhich the casing A is secured in position. The opposite end of said boltBis provided with a handle b whereby it may be operated, said handleprojecting from the opposite side of the casing A. The said casing A isalso formed with a plurality of vertical grooves a, in which are mountedthe tumblers D. Each of the grooves a is adapted to correspond inposition with one of the notches b of the bolt 13, so that when saidbolt B is in the proper position the respective tumblers of the groovesa will look into engagement with said notches b and th us prevent thewithdrawal of thebolt. Each of said tumblers D is provided with a groove(Z, forming a shoulder (1. A longitudinal groove a is formed in saidbase A and intersects the grooves a. This groove is adapted for thereception of the key 0, which projects at one end from said casing A andis provided with an operating-handle c. Said key is provided with aplurality of vertical projections 0, adapted to correspond in positionwith the grooves a when the key is in the proper position. The rear ofthe passage (L2 is provided with a segmental guide or spring a It willbe observed from the foregoing description that when the tumblers D arein engagement with the notches b of the bolt they prevent said bolt frombeing moved. When it is desired to unlock .the bolt, the key 0 is forcedinto the passage a until the rear end of said key engages the segmentalspring a This forces this end of the key upward, so that one of theprojections c engages the shoulder d of the end tumbler and presses saidtumbler out of its notch in the bolt. The key is then raised at itsforward end, the rear end acting as a fulcrum, which action causes allthe projections cto engage all of the shoulders upon the tumblers andraise said tumblers, thus permitting the bolt to be withdrawn. lVhen itis desired to lock the key in the lock against any accidentaldisplacement after the bolt B has been partly withdrawn, the said bolt13 is only withdrawn far enough to permit the last tumbler D within theeasing A to rest with its lower end in the notch 17. This lasttumbler'thus prevents the entire withdrawal of the bolt, while theremaining tumblers by their elevated positions hold the key so elevatedthat its projections 0 cannot disengage from the grooves a to permit thewithdrawal of the key. To withdraw the key it is first necessary toshoot the bolt.

It will be observed from the foregoing description that when the bolt isin its withdrawn position the key cannot be removed. The constructionand operation of this lock are Verysimple, and no complicated partsliable to injury or disarrangement are employed. The lock isparticularly applicable to very heavy doors, in which the bolts must beshot by hand because of their weight. It will also be observed that theaction of this look does not in anywise depend upon springs, and it isnext to impossible to release the bolt 13 when it is shot without theemployment of the proper key, as all of the tumblers arranged along thecasing must be lifted at the same time to permit this withdrawal.

Having thus described myinvention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a lock,.the combination with a suitable casing, of a pluralityofvertically-movable tumblers mountedtherein, a sliding bolt alsomounted in said casing, and provided with a protruding operating-handleand a plurality of notches along its upper edge, one of which isprovided witha shallow notch or extension in which one of the tumblersoperates to prevent the entire withdrawal of the bolt but at the sametimepermits of its being drawn into the casing, and a removable keyhavingprojections uponitsupperedge adapted to lift the tumblers and alsoprevent its withdrawal from the casing while held in an elevatedposition by the tumblers engaging the top .of the bolt; the constructionand operation being such that when the bolt is drawn, the key as well asthe bolt is locked in said casing against withdrawal, substantially asdescribed.

2. In a lock, the combination with a suitable casing having key and boltreceiving grooves, of a sliding removable bolt mounted in said groovesand provided with a protruding operating-handle formed along its upperedge with a plurality of notches, vertical movable tumblers mounted insaid casing, an inclined key-elevating guide located at the rear of thekey-groove, and a key provided with tumbler-en gagin g projections andadapt ed to be forced into the casing and caused to rise to elevate thetumblers by engaging the inclined guide at the rear of the key-grooveJOHN J. Pnrnnson Witnesses .JoHN B. Mia-HON, B. KINsELL,

and riding up overthe same, substantially as described.

